4.4 Characters

The unique value of the member of the execution character set produced
for each of the standard alphabetic escape sequences (5.2.2).

The value of a char object into which has been stored any
character other than a member of the basic execution character set (6.2.5).

Which of signed char or unsigned char has the same range,
representation, and behavior as “plain” char (6.2.5, 6.3.1.1).

The mapping of members of the source character set (in character
constants and string literals) to members of the execution character
set (6.4.4.4, 5.1.1.2).

The value of an integer character constant containing more than one
character or containing a character or escape sequence that does not map
to a single-byte execution character (6.4.4.4).

The value of a wide character constant containing more than one
multibyte character, or containing a multibyte character or escape
sequence not represented in the extended execution character set (6.4.4.4).

The current locale used to convert a wide character constant consisting
of a single multibyte character that maps to a member of the extended
execution character set into a corresponding wide character code (6.4.4.4).

The current locale used to convert a wide string literal into
corresponding wide character codes (6.4.5).

The value of a string literal containing a multibyte character or escape
sequence not represented in the execution character set (6.4.5).